New to Tower Gardening? Start here: 👉 Get Started with Tower Garden

The #1 Reason Tower Gardens Fail

Not enough light. This leads to slow growth, weak stretching plants, and poor harvests.
If light isn’t right, nothing else will fix it and once it happens you can't reverse it.

If your plants aren’t thriving, this is the first place to look.

In this Guide You'll Find...

Tower Garden FLEX Outdoors

How Much Light Does a Tower Garden Need?

  • Minimum sunlight: 5+ hours for leafy greens. 8+ for fruiting crops
  • Must be full, unobstructed sun
  • Inside: Tower Garden LED lights on for 14-16 hours with 8-10 hours of complete darkness.

    Bright shade is not enough.

  • Indoor Growing

    • Requires grow lights
    • 14–16 hours/day to match circadian rhythm
    • Plants must have darkness overnight

  • Outdoor Growing

    • Direct, unfiltered sun
    • Avoid shading from buildings and trees
Tower Gardne HOME with LED Lights

💡 Indoor Tower Garden Lighting Requirements

• Run continuously for 14–16 hours per day
• Position them equidistant from plants

Plants need complete darkness at night.

👉 Growing Indoors with Tower Garden: Read the full guide


New to indoor growing?
👉 Check out our complete guide to troubleshooting indoor Tower Garden growing issues.



Tower Garden HOME Outdoors

💡 Outdoor Tower Garden Sunlight Requirements

  • Direct, unfiltered sun.
  • Be sure to account for buildings and trees that may shade your Tower Garden

👉 Outdoor Tower Garden Sunlight Requirements: Read the full guide

Growing on a Lanai or Screened Porch

Growing on a lanai or screened porch can seem like a great option, but the screen and roof can significantly reduce the amount of light your plants receive.

Even if it looks bright, your Tower Garden may not be getting enough direct sunlight to grow at its best.

If your plants are growing slowly, stretching, or not producing well, your location could be the reason.

👉 Growing on a screened porch? Here’s what you need to know

Should You Use a Shade Cloth?

Usually no.

It reduces sunlight, which can slow growth and is not something we recommend, even in Florida.

They can be used when air temperatures are consistently over 100°.

Signs Your Tower Garden Isn’t Getting Enough Light

If you’re seeing one or more of these, light is likely at least one issue.

  • Pale Leaves

    Leaves lose their deep green color and look weak or washed out.

  • Leggy Plants

    Plants grow tall and thin, reaching for light instead of filling out.

  • Tower Garden plants stretching for more light

    Low Production

    Fewer leaves, smaller harvests, and poor overall yield.

Common Tower Garden Light Mistakes

👉 Important to know:
If a plant hasn’t received enough light, the effects are often permanent.

Leggy growth caused by low light can’t be reversed. Even after correcting the lighting, the plant won’t return to a compact, healthy structure.

Plants that have been grown in low light are also often too weak to handle sudden exposure to full sun, and may decline quickly or even die when moved outdoors.

👉 This is why getting light right from the start is one of the most important factors for success.

❌ Not Getting Enough Direct Sunlight (Outdoor Growing)

This is the #1 issue we see.

A Tower Garden might look like it’s in a bright spot, but if it’s not getting at least 5 hours of direct sunlight (ideally closer to 8+ for fruiting plants), growth will suffer.

Common signs:

  • Slow growth
  • Small leaves
  • Leggy, stretched plants
  • Pale, washed out colored leaves

👉 What to do:
Make sure your Tower is placed where it gets true, direct sun. Watch how the sun moves throughout the day. Even partial shade from a fence, house, or nearby plants can make a big difference. If you wouldn't get a sun tan in that location, it's not enough.

❌ Using a Shade Cloth When It’s Not Needed

We see this a lot, especially in Florida.

While shade cloth can be helpful in extreme heat, it often reduces light more than people realize and can actually slow plant growth.

In most cases, it’s not needed — even in summer.

👉 What to do:
Remove shade cloth and monitor your plants. In our experience growing in both Central and South Florida, Towers perform better with full sun than with reduced light.

❌ Running Lights Over Night

More light is not always better.

Plants need a dark period to complete their natural growth cycle. Running lights all night can actually stress plants and reduce performance.

👉 What to do:
Run lights for 14–16 hours per day, then allow for complete darkness at night.

❌ Grow Lights Too Far Away (Indoor Growing)

Your plants rely completely on grow lights indoors. If the lights are too far away, they simply won’t get what they need.

Common signs:

  • Tall, thin, “stretchy” plants
  • Weak stems
  • Pale leaves

👉 What to do:
Keep grow lights close and equidistant from your plants and adjust as they grow.

❌ Letting Larger Plants Block Smaller Ones

Think of your plants like solar panels — they need access to light.

When larger plants (like tomatoes or cucumbers) grow above smaller ones, they can block light and slow growth below.

👉 What to do:
Follow a pyramidal planting approach:

  • Larger plants toward the bottom
  • Smaller plants toward the top

And prune when needed to keep light flowing through the tower.

❌ Towers Placed Too Close Together

If you’re running multiple towers, spacing matters.

When towers are too close, they can shade each other, especially in the morning and afternoon when the sun is at an angle.

👉 What to do:
Give your towers enough space so each one gets full sun throughout the day.

Troubleshooting Indoor Growing

If you’re growing indoors, lighting is just one piece of the puzzle. Issues like pollination and pests can also impact plant health.

👉 Read our full guide on troubleshooting indoor growing issues.

💡 Final Tip

If your plants aren’t thriving, light is almost always one of the first things to check.

In our experience, most issues aren’t caused by nutrients or water — they come down to not enough usable light reaching the plant.

Fix the light, and everything else gets easier.

Frequently Asked Questions

  • How much sunlight does Tower Garden need?

    Leafy greens, lettuces and herbs need a minimum of 5+ hours. Fruiting crops need 8+ hours.

  • When starting seedlings how much sunlight do they need?

    Seedlings need around 8 hours or more of direct sunlight to produce strong healthy seedlings.

  • Can a Tower Garden grow in the shade?

    No, direct sunlight is required

  • Can I grow Tower Garden indoors?

    Yes, with Tower Garden LED grow lights

  • How long should Tower Garden LED Grow lights run?

    Continuously for 14–16 hours per day